Class: ImageProcessing::Pipeline

Inherits:
Object
  • Object
show all
Defined in:
lib/image_processing/pipeline.rb

Constant Summary collapse

DEFAULT_FORMAT = 
"jpg"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Pipeline

Initializes the pipeline with all the processing options.



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# File 'lib/image_processing/pipeline.rb', line 10

def initialize(options)
  options.each do |name, value|
    value = normalize_source(value, options) if name == :source
    instance_variable_set(:"@#{name}", value)
  end
end

Instance Attribute Details

#destination ⇒ Object (readonly)

Returns the value of attribute destination.



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# File 'lib/image_processing/pipeline.rb', line 7

def destination
  @destination
end

#format ⇒ Object (readonly)

Returns the value of attribute format.



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# File 'lib/image_processing/pipeline.rb', line 7

def format
  @format
end

#loader ⇒ Object (readonly)

Returns the value of attribute loader.



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# File 'lib/image_processing/pipeline.rb', line 7

def loader
  @loader
end

#operations ⇒ Object (readonly)

Returns the value of attribute operations.



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# File 'lib/image_processing/pipeline.rb', line 7

def operations
  @operations
end

#processor ⇒ Object (readonly)

Returns the value of attribute processor.



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# File 'lib/image_processing/pipeline.rb', line 7

def processor
  @processor
end

#saver ⇒ Object (readonly)

Returns the value of attribute saver.



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# File 'lib/image_processing/pipeline.rb', line 7

def saver
  @saver
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/image_processing/pipeline.rb', line 7

def source
  @source
end

Instance Method Details

#call(save: true) ⇒ Object

Performs the defined series of operations, and saves the result in a new tempfile or a specified path on disk, or if ‘save: false` was passed in returns the unsaved accumulator object that can be used for further processing.



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# File 'lib/image_processing/pipeline.rb', line 21

def call(save: true)
  accumulator = processor.load_image(source, **loader)

  operations.each do |name, args, block|
    accumulator = processor.apply_operation(accumulator, name, *args, &block)
  end

  if save == false
    accumulator
  elsif destination
    handle_destination do
      processor.save_image(accumulator, destination, **saver)
    end
  else
    create_tempfile do |tempfile|
      processor.save_image(accumulator, tempfile.path, **saver)
    end
  end
end

#destination_format ⇒ Object

Determines the appropriate destination image format.



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# File 'lib/image_processing/pipeline.rb', line 47

def destination_format
  format   = File.extname(destination)[1..-1] if destination
  format ||= self.format
  format ||= File.extname(source_path)[1..-1] if source_path

  format || DEFAULT_FORMAT
end

#source_path ⇒ Object

Retrieves the source path on disk.



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# File 'lib/image_processing/pipeline.rb', line 42

def source_path
  source if source.is_a?(String)
end